Steam-boiler furnace



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STEAM BOILBR FURNACE. No. 579,340. Patented Mar. 2s, 1897.V

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W. C. DOU'IHETT.

STEAM BOILER FURNAGE.

No. 579,340. PatentedMar. 23, 1897.

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XVILLIAM C. DOUTIIETT, OF PITTSBURG, PENNSYLVANIA.

STEAM-BOILER FU RNACE.

SPECIFICATION forming part 0f Letters Patent N0. 579,340, dated March 23, 1897. Application iiled February 15, 1896. Serial No. 579,420. (No model.)

To @ZZ wwnt it may concern.

Be it known that I, WILLIAM C. DoU'rHnrr, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Steam-Boiler Furnaces, of which the following is a specification.

This invention is an improvement in steamboiler furnaces; and it consists in certain novel constructions and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In the drawings, Figure lis a vertical longitudinal section of a furnace constructed according to my invention. Fig. 2 is a detail view of one of the grate-bars. Fig. 3 is a detail View of the main section of the grate-bar. Fig. 4 is a detail view of the agitating-section of the gratefbar. Fig. 5 is a crosssectional view of a series of grate-bars on about line 5 5, Fig. l; and Fig. (S is a partial top plan view of the grate.

The grate is composed of a series of gratebarsA and a series of grate-bars B, the bars A and B alternating and the bars A being connected with the cross connection C and being movable longitudinally therewith, while the bars B are held from longitudinal movement bythe stirrups b thereon iitting over the supporting-shafts D, as shown in Fig. l. In general construction the bars A and B are alike, but Iprefer to form the bars AWith the comparatively long coking-plates a at their upper ends. Each of the grate-bars is composed of a main section E and an agitatingsection F, the section F having blocks which are movable up and down in such main section, and the specic construction of the sections E and F being as shown and as I will now describe. The main section E is formed with the side plates e, having at their upper edges upwardly-projecting lugs e', connected by crossplates c2, forming heads at the upper side of the main section, which heads alternate with intervening spaces e3, in which spaces the blocks of the agitating-section operate. These blocks are movable up and down and when lowered rest at their upper edges flush with the tops of the heads of the main section and when raised project above the said main section and form raking attachments, as will be readily understood from the drawings. These blocks F of the agita-tingsection are provided with downwardlyefacing shoulders f, which limit the downward movement of the blocks, and I also provide these blocks with facing-stripsf, which hold them apart from the heads of the main section to form air# spaces. Shanks F2 depend from the heads F and are provided with guides extending in the direction of length of the grate-bars and yadapted for engagement by the bar Gr,` which connects the several blocks of the agitatingsections, so su ch blocks may be moved up and down together, the bar G also forming ra bearing for engagement by the arms of the rocker presently described.

The hollow connection or cross-head C is made fast to the several bars A and has its outer end open from side to side to receive air and is provided at its inner end with a series of perforations C', extending from side to side and adapted to feed air into the furnace at the upper end of the grate. This cross-.head is connected by a link C2 with an arm C3 on the main shaft H, so that the rocking of such shaft will tend to reciprocate the series of bars A. Ifl, which is connected by suitable links with the piston-rod of a water-motor I, by the slow operation of which-the shaft II will be rocked and the series of bars A slowly reciprocated. A link 7L connects wit-h the arm H and also with a pawl-carrying-arm 7L', by which to operate the revolving feeder h2 in the manner which will be readily understood from Fig. l. Adjacent to this feeder 7121 provide the sliding door h3, which is counterbalanced by a weighthA1 and may be readily raised to aord free access to the upper end of the furnace atv any time desired. I also provide the arm II with a depending arm H2, which is provided with bearings H3 and H4 for the purpose presently described. An arm J depends from the main shaft H and is provided with a bearingj, the purpose of which will be described hereinafter.

The shafts D support the grate-bars and also form parts of the rockers. These shafts are provided with arms D2 and D', the former being arranged to engage the bars G of the grate-bars A and the latter being arranged This shaft H has an arm IOC . grate-bars B resting upon the arms D.

to engage the bars G of the grate-bars B. By this construction as the shafts D are rocked in one direction they will tilt the blocks of the grate-bars A upward and in the other direction will tilt upward the blocks of the grate-bars B. To rock these shafts D, I provide them with depending arms D3, which are connected bya link D4, and the arm D3 of the upper shaft D is provided with an operatingpitman K and a detent-pitman L, both of which are jointed to the arm D3, as shown in Fig. l. The pitman K has a notch K' to receive the bearing or projection q7' and is extended above the bearing H4 on the part H2. The pitman or rod L has a notch L to rcceive a pin L2 on the framing of the furnace, and this rod L is extended above the bearing H3 on the part H2. Now in operation if the pin j be seated in the notch K and the main shaft H be operated the shafts D will be rocked, and when such rockinghas operated to bring the arms D to their uppermost position the notch L will drop over the pin L2, and at the same instant the bearing Hl will lift the pitman K out of engagement with the projection j, and the rocking of shafts D will cease until the pitman or rod L is released. This will not be accomplished until the gratebars A have been given their full downward stroke, when the bearing H3 will engage under the rod L and lift its notch Ll out of engagement with the pin L2, and the weight of the grate-bars and the coal thereon will readj ust the shafts D to position, with the gratebars A resting upon the arms D2 and the Then on the reverse movement of the main shaft H the pin j will at the proper time engage in the notch K and cause the arms D2 to lift the agitating-blocks of the grate-bars D.

The ash-discharge includes a gate M, pivoted at M and havingits other end provided with a handle-rod extending to the front end of the machine and provided with a notchblock M2, engaging a catch M3 and operating to hold the gate M normally in position and yet permitting the ready dumping thereof when desired. The dump also has a rotary discharger N, whose ratchet-teeth areengaged by a pawl on a swinging carrier N', connected by a pitman N2 with the arm D3 of the lower shaft D.

I have shown the grate as inclined. It will be understood that this is desirable in selfstokers; but for hand use the grate may be arranged horizontally without departing from some of the principles of my invention. Over the upper end of the grate I arrange the front arch O, having a transverse air-flue O and an outlet O2 onto the grate. Side flues P connect with the flue Ol and extend back and connect with the transverse air-Iiue P in the intermediate arch P2, air being supplied to the flue P in anysuitable manner and becoming thoroughly heated before it is dis- 'charged at O2 onto the upper end of the grate.

Having thus described my invention7 what I claim, and desire to secure by Letters Patent, is-

l. A furnace-grate bar composed of a main section having in its top alternating heads and spaces and the agitating-sections provided with blocks operating in the said spaces and having lateral shoulders by which to engage the main section and limit the downward movement of the said blocks substantially as set forth.

2. A furnace-grate bar composed of the main section having in its top spaces at intervals the agitating-blocks operating in said spaces and provided with inwardly-projecting shanks and the bar connected with said shanks and uniting the several blocks, substantially as shown and described.

3. A furnace-grate bar composed of the main section havingheads, the agitating-sections having blocks alternating with the heads of the main sections and provided with undercut recesses opening in the line of the grate-bar and the connecting-bar fitting in said recesses, substantially as set forth.

4:. The grate-bar herein described composed of the main section having side plates having at their upper edges upwardly-projecting lugs supporting cross plates and forming heads, the agitating-section having blocks fitting between said lugs and provided with downwardly-facing stop-shoulders and with edge ribs and having the shanks projected into the main section and provided with undercut recesses and the connecting-bar engaging in said recesses substantially as set forth.

5. A furnace-grate composed of a series of longitudinallymovable bars, an air -inlet tube connecting said bars at one end, a series of grate-bars arranged alternately with said longitudinally-movable bars, and agitating-sections substantially as shown and described.

G. The combination with the longitudinallymovable grate-bars, the grate-bars held from such movement and the operating devices, of the rockers, means for operating the same and a detent connected with the rockers and adapted to hold the same in a given position, substantially as set forth.

7. The combination with the grate -bars having the vertically-moving portions and the rockers by which to lift said portions, of mechanism by which to move said gratebars lon gitudinally,connections between said mechanism, and the rockers, devices for releasing said connections and a detent for holding the rockers when said connections are released substantially as set forth.

S. The combination with the grate-bars and the rockers, of the main shaft having a projecting arm, a pitman connected with the rocker and detachably engaged with the arm of the main shaft, a detent-pitman connected with the rocker and detachably engaged with the frame, a releasing device having portions IOO IIO

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moving into engagement with the rocking and detent pitmen and a swinging carrier for said releasing device, substantially as set forth.

9. A grate-bar composed of a main section and an agitating-section movable longitudinally with, and up and down independently of said main section, substantially as shown and described.

l0. A grate-bar comprising a main section and an agitating-section movable longitudinally With and up and down independently of said main section, combined with means by Which to reciprocate the grate-bar and devices independent of said reciprocating means for lifting the agitating-section, substantially as shown and described.

ll. A grate-bar composed of a hollow longitudinally-extended main section having1 its interior chamber or space extended approximately from end to end of the said section and unbroken or unobstructed from end to end, and the agtating-section fitting and extending longitudinally Within said main section substantially as shown and described.

l2. A grate-bar composed of a hollow longitudinally-extended main section, an agitating-section composed of aconnecting-bar extending longitudinally approximately from end to end of the main section, and agitatingblocks carried by said connecting-bar and operated thereby up and down Within said main section substantially as shown and described.

13. The grate-bar herein described composed of the main section formed With side plates having at their upper edges upwardlyprojecting lugs supporting cross-plates and forming heads, and the agitating-section having blocks iitting and operating between said lugs substantially as shown and described.

14. The improved grate bar herein described consisting of the main section composed of side plates connected at their upper ends by cross-plates spaced apart, and an agitating-section extending longitudinally in said main section and provided with blocks fitting and operating between the said crossplates substantially as shown and described.

VILLIAM C. DOUTHETT.

Vitnesses:

P. B. TURPIN, SoLoN C. KEMON. 

